Malicious PDF — malware analysis report

Static analysis result for SHA-256 99243dc78b2399e5…

MALICIOUS

PDF

40.0 KB Created: 2020-08-24 12:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2796e3d142451dfe4bf065ed417a72fe SHA-1: d6ab31621ea8dfd4fa582a5a813959983ccf50de SHA-256: 99243dc78b2399e5f4612427c32d139b83ba7bfdbc9e6b8fd3849c96aac8269b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=eukaryotic+chromosome+structure+answers', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to lure victims. The presence of multiple external links, including a malicious redirector, strongly indicates an attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=eukaryotic+chromosome+structure+answers In PDF document text
    • http://files.zummoscafescranton.com/uploads/1/3/0/7/130739480/jivoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/rads_error_lol_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mokotutirajozejimus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/scala2_water_booster_pump_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/lowes_ludington_mi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xeniwepisovera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/43396759907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/naqaab_bengali_movie_all_video_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/vigipuben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1921/4758/files/99136582097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/list_of_percussion_instruments_with_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/apical_dominance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/63310150221.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
🗂 Part of campaign: zummoscafescranton.com 6 samples

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC2 5220 bytes
SHA-256: 29c67fca2beeb69d5aeeb4a725b9fbff0b1a3b6d3643b895733e812985d103cc
font_01_sfnt_off0000707a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 10084 bytes
SHA-256: 09df23a84c02ae5ce2dfa1ebae207b50e96eb406bc405629a1d33278ac0a3a55

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